Bug 1203643 (CVE-2022-3204)

Summary: VUL-0: CVE-2022-3204: unbound: NRDelegation attack leads to uncontrolled resource consumption (Non-Responsive Delegation Attack)
Product: [Novell Products] SUSE Security Incidents Reporter: Robert Frohl <rfrohl>
Component: IncidentsAssignee: Rubén Torrero Marijnissen <rtorreromarijnissen>
Status: NEW --- QA Contact: Security Team bot <security-team>
Severity: Minor    
Priority: P3 - Medium CC: michael, rtorreromarijnissen, security-team, stefano.torresi, stoyan.manolov
Version: unspecifiedFlags: stoyan.manolov: needinfo? (rtorreromarijnissen)
stoyan.manolov: needinfo? (stefano.torresi)
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/343142/
Whiteboard: CVSSv3.1:SUSE:CVE-2022-3204:7.5:(AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Found By: Security Response Team Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description Robert Frohl 2022-09-22 06:45:22 UTC
rh#2128947

The attack can cause a resolver to spend a lot of time/resources resolving records under a malicious delegation point where a considerable number of unresponsive NS records reside. It can trigger high CPU usage in some resolver implementations that continually look in the cache for resolved NS records in that delegation. This can lead to degraded performance and eventually denial of service in orchestrated attacks.

Upstream has issued an advisory today (September 21):
https://nlnetlabs.nl/downloads/unbound/CVE-2022-3204.txt

The issue is fixed upstream in 1.16.3:
https://github.com/NLnetLabs/unbound/releases/tag/release-1.16.3

References:
https://bugzilla.redhat.com/show_bug.cgi?id=2128947
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-3204
Comment 2 Robert Frohl 2022-09-22 07:24:35 UTC
tracking as affected:

- SUSE:SLE-15:Update/unbound
- SUSE:SLE-15-SP1:Update/unbound